Is anyone having flickering or visual noise issues with the latest 27" iMac (2012-13)?

Hi everyone,
I received my 27" iMac a couple days ago via the online store. I've been so busy that I've hardly been on it, but I noticed last night that the entire screen was flickering to black. I looked closely and also noticed that there was very faint visual noise (or "snow") when the display would flicker on. In a panic, I shut down my computer and plugged it into another outlet to see if that could be the problem. I haven't noticed any problems since then, but I am skeptical as the initial incident was so random.
I have called Apple Care twice and they have been very helpful, but I also heard different versions of what to do: 1) Get an official diagnosis that it is in fact the hardware, and do a straight-up exchange, and 2) take it to an official Apple repair shop.
Either way, want to know if anyone else has had a similar problem; and if so, is it worth trying to get repaired? The repair shop was suggested because I'm about an hour drive from the nearest Apple retail store (which is frustrating in itself), but I would much rather get it exchanged than go back and forth with diagnostics and repairs.
Thanks for the help!
*Disclaimer: I am very satisfied with the Apple Care service I have been given thus far, just frustrated and disappointed that my brand new expensive computer is giving me problems out of the box, and that I'll have to travel to get it replaced. Not to mention I've already installed a bunch of fonts and software! Ugh.

I'm using a Spyder3Pro with the new iMac and haven't run into problems. I did bring down the brightness three notches before calibrating - that LED is very bright.
I know there were problems with the previous generation's glossy screens (too bright) but I've gone from the old matte version to this one and I'm loving it.

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Is anyone having flickering or visual noise issues with the latest 27" iMac (2012-13)?

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